I'm going to assume that you don't know much about computers...and so I'll be nice & explain this one more time (even though it's already been said multiple times in this thread).
The G4 cpu in a Powerbook G4 is NOT a hyper-threading processor. A G4 cpu is a "single core" processor. Core 2 Duo cpu's...like in older MacBooks & MacBook Pro's...are like having 2 cpu's. Core 2 Duo cpu's do not have hyperthreading either!:
Hyper-threading - Wikipedia, the free encyclopedia
Hyper-threading is found in Xeon cpu's (like in Mac Pro desktop computers)...and the new Intel i3, i5, and i7 cpu's.
- Nick
You're wrong. According to my research they are hyper threaded. After i purchase it I'm going to install an i7 in there.